The package documentation states, that the option tight should reduce the vertical spacing between the entries in the shorttoc, but in my example it doesn't. I suspect, this is due to this part of shorttoc.sty?

1 Answer
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As \parsep is the vertical space between paragraphs of a list item, I'm at a loss why redefining it should change the spacing between ToC lines. For section entries, the latter is controlled by the \l@section macro (which contains the line \addvspace{1.0em \@plus\p@}), and this macro needs to be redefined. If you want to change the spacing only for the short ToC, the redefinition must be done inside a group. (Note: I'm using the etoolbox package and its \patchcmd macro for convenience.)